A study by Scrogin et al. (A-11) was designed to assess the effects of concurrent manipulations of dietary NaCl and calcium on blood pressure as well as blood pressure and catecholamine responses to stress. Subjects were salt-sensitive, spontaneously hypertensive male rats. Among the analyses performed by the investigators was a correlation between baseline blood pressure and plasma epinephrine concentration (E). The following data on these two variables were collected.

Let a ¼ :01.

BP PlasmaE BP PlasmaE 163.90 248.00 143.20 179.00 195.15 339.20 166.00 160.40 170.20 193.20 160.40 263.50 171.10 307.20 170.90 184.70 148.60 80.80 150.90 227.50 195.70 550.00 159.60 92.35 151.00 70.00 141.60 139.35 166.20 66.00 160.10 173.80 177.80 120.00 166.40 224.80 165.10 281.60 162.00 183.60 174.70 296.70 214.20 441.60 164.30 217.30 179.70 612.80 152.50 88.00 178.10 401.60 202.30 268.00 198.30 132.00 171.70 265.50 Source: Data provided courtesy of Karie E. Scrogin.